Ferguson Police Chief Tom Jackson says he planned to release the officer's name on Tuesday but changed course after threats were called into the police department and City Hall, and posted on social media.

Jackson didn't disclose specifics but says releasing the officer's name could immediately make the officer a target.

The case has stoked racial tension, protests and looting in Ferguson, a predominantly black city with roughly 21,000 residents.

St. Louis County are investigating the shooting, the FBI has launched a civil rights investigation.